package com.wc.AlgoOJ_homework.AlgoOJ_test1.F_吃糖果;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.StringTokenizer;

/**
 * @Author congge
 * @Date 2024/3/4 21:11
 * @description http://43.138.190.70:8888/p/696?tid=65e5737f27489dab814f4d03
 */
public class Main {
    static FastReader sc = new FastReader();
    static PrintWriter out = new PrintWriter(System.out);
    static int N = 150010;
    static int[] a = new int[N];
    // 前缀和
    static int[] s = new int[N];
    static int t, n, q, x;

    public static void main(String[] args) {
        t = sc.nextInt();
        while (t-- > 0) {
            n = sc.nextInt();
            q = sc.nextInt();
            for (int i = 1; i <= n; i++) a[i] = sc.nextInt();
            Arrays.sort(a, 1, n + 1);
            for (int i = 1; i <= n; i++) s[i] = s[i - 1] + a[n - i + 1];
            while (q-- > 0) {
                x = sc.nextInt();
                if (s[n] < x) {
                    out.println(-1);
                } else {
                    out.println(query(x));
                }
            }
        }
        out.flush();
    }

    static int query(int x) {
        int l = 1, r = n;
        int res = 0;
        while (l <= r) {
            int mid = l + r >> 1;
            if (s[mid] >= x) {
                res = mid;
                r = mid - 1;
            } else l = mid + 1;
        }
        return res;
    }
}

class FastReader {
    StringTokenizer st;
    BufferedReader br;

    FastReader() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }

    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }

    int nextInt() {
        return Integer.parseInt(next());
    }

    String nextLine() {
        String s = "";
        try {
            s = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return s;
    }

    long nextLong() {
        return Long.parseLong(next());
    }

    double nextDouble() {
        return Double.parseDouble(next());
    }

    // 是否由下一个
    boolean hasNext() {
        while (st == null || !st.hasMoreTokens()) {
            try {
                String line = br.readLine();
                if (line == null)
                    return false;
                st = new StringTokenizer(line);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return true;
    }
}
